The alloying element of 2024 is copper, which is called hard aluminum. It has high strength and good machinability but poor corrosion resistance. Widely used in aircraft structures (skin, skeleton, ribs, bulkheads, etc.), rivets, missile components, wheel hubs, propeller components, and various other structural components. Chemical Composition Limits wt% Cu Si Fe Mn Mg Zn Cr Ti Pb.Bi Al 3.8-4.9 0.50 0.50 0.3-0.9 1.2-1.8 0.25 0.10 0.15 / margin Typical Alloy 2024-T351 Mechanical and Physical Properties (Typical Mechanical & Physical Properties) Weldability Machinability Corrosion resistance Conductivity 20°C (68?) (%IACS) density (20°C)(g/cm3) Restricted well difference 30-40 2.78 tensile strength (25°C MPa) Yield Strength (25°C MPa) hardness 500kg force 10mm ball Elongation rate 1.6mm (1/16in) thickness Large shear stress MPa 472 325 120 10 285